Just by accident a lucky mankind witnesses a rare coincidence: despite the
steadily increasing distance Earth-Moon nowadays the current value is so
well balanced, that due to the eccentricity of the orbits of the Earth around
the Sun and of the Moon around the Earth the apparent diameters of Sun and Moon
from Earths surface are very close and mostly the Moon just bigger appearing
than the Sun, sometimes lower (the last leads to the so-called annular eclipses).
During the Dinosaurs ruling the moon was nearer and covered a lot of the
interesting parts of the Sun during ecplises too, this was much less spectacular,
and in a few hundred million years the receding moon will no more be able to
cover the Suns disk (aside from the also slowly increasing diameter of the Suns
photosphere).

And these rare events, when the alignment of Sun, Earth and Moon is especially
good (remember that the Moons orbital plane is tilted about 5 degrees against
the Earths orbital plane, so only sometimes, when the Moon passes one of the
knots with Earths orbital plane during new moon phase, it happens) create the
most stunning periodical astronomical phenomenon in our sky: the total eclipse of our Sun,
with the thin corona appearing around the Suns photosphere covering disk of our
moon.